Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 76553-78X26 found under Pad Bearing Valve by Electric Boat Corp. The National Stock Number assigned to this part is 4820012090411, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 76553-78X26.